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  • How does landscape calculate free memory?

    - by David Planella
    I'm trying to debug an OOM situation in an Ubuntu 12.04 server, and looking at the Memory graphs in Landscape, I noticed that there wasn't any serious memory usage spike spike. Then I looked at the output of the free command and I wasn't quite sure how both memory usage results relate to each other. Here's landscape's output on the server: $ landscape-sysinfo System load: 0.0 Processes: 93 Usage of /: 5.6% of 19.48GB Users logged in: 1 Memory usage: 26% IP address for eth0: - Swap usage: 2% Then I run the free command and I get: $ free -m total used free shared buffers cached Mem: 486 381 105 0 4 165 -/+ buffers/cache: 212 274 Swap: 255 7 248 I can understand the 2% swap usage, but where does the 26% memory usage come from?

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  • How do people deal with Android fragmentation?

    - by Bill
    I've spent the past few years working on iOS apps, and I'm now giving some serious consideration to creating an Android port of one of my apps. I'm sure that complaints about fragmentation are a frustrating cliche to experienced Android programmers, but as an iOS programmer, I'm quite honestly overwhelmed by the number of configurations and devices that my app might end up running on. There are literally thousands of Android devices in the wild, but I know there are successful Android developers in the world and I know they're not testing or developing for thousands of different devices. So how can a relatively small company deal with fragmentation? Is it possible to pick the five or six most popular devices, focus on those and prevent the app from being installed on any other devices? Are there any other strategies for practically dealing with the number of different configurations an app will face?

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  • Ask the Readers: Favorite Deal App?

    - by Jason Fitzpatrick
    Black Friday is mere days away and the holiday shopping season is upon us. This week we want to hear about your favorite deals apps—how do you find the best deals on the go? The parameters for this week’s Ask the Readers question are pretty straight forward: we want to hear about your favorite deal finding/deal comparison smart phone app. Whether it’s for Android, iOS, or a web site with a very cleanly formatted mobile interface, we want to hear about how you score serious deals out in the field. How do you know if the deal you see in the store is the best deal? Sound off in the comments with your favorite deal app and then check in on Friday for the What You Said roundup. How to See What Web Sites Your Computer is Secretly Connecting To HTG Explains: When Do You Need to Update Your Drivers? How to Make the Kindle Fire Silk Browser *Actually* Fast!

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  • Additional useful skill?

    - by Sergey
    Almost each language has some additional technology or skill or whatever which can work in a pair with it but still be something fresh. For example, Java + Flex. It's a good pair - those who learn Java and want something both useful and new may try Flex. What are "pairs" for the most popular languages(Java, C#, C++, etc.)? PS: Most people advise learning functional programming as an additional skill but this is very fuzzy. They talk about such abstract things as wide programming perspective and other things, but you can hardly say whether these functional skills will be really needed. Yeah, maybe some basics of it can be useful, but serious learning of LISP seems not perspective.

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  • Updated Google Search for iPad Rocks Side-by-Side Search and More

    - by Jason Fitzpatrick
    iPad: If Google is your search engine of choice and you do some serious searching from your iPad, you’ll want to grab a free copy of Google’s radically updated iPad search app. What’s new with Google iPad Search? This version of the app sports Google Instant, coverflow style image search, enhanced voice search, Google+ integration, and overall better integration with Google’s services. Our favorite feature, by far, is the enhanced side-by-side search. You can pull up search results and simultaneously look at a page–watch the video above to see it in action. The New Google Search App for iPad [Google Mobile Blog] HTG Explains: When Do You Need to Update Your Drivers? How to Make the Kindle Fire Silk Browser *Actually* Fast! Amazon’s New Kindle Fire Tablet: the How-To Geek Review

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  • When there's no TCO, when to worry about blowing the stack?

    - by Cedric Martin
    Every single time there's a discussion about a new programming language targetting the JVM, there are inevitably people saying things like: "The JVM doesn't support tail-call optimization, so I predict lots of exploding stacks" There are thousands of variations on that theme. Now I know that some language, like Clojure for example, have a special recur construct that you can use. What I don't understand is: how serious is the lack of tail-call optimization? When should I worry about it? My main source of confusion probably comes from the fact that Java is one of the most succesful languages ever and quite a few of the JVM languages seems to be doing fairly well. How is that possible if the lack of TCO is really of any concern?

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  • Does Google include the time to load images, for a single page, as part of the page speed?

    - by Pure.Krome
    we all know that Google's affects your page rank with the load time of a page. How? That's part of the secret sauce. But we know that page speed is a serious factor. So - what is considered the speed of a page? Is it just the first (and main) html file which the GET receives? Or does it also include loading of images as part of that speed. so for example... GET /index.htm <- takes 0.45 seconds to retrieve (including DNS lookup before). robot parses page.. see's there's a single main image.... GET /img/main.png <- takes 5 seconds to download. is the page speed for that resource, 0.45 seconds OR 5.45 seconds? I understand Javascript is not fired .. but are any of these external resources all downloaded and part of the page speed?

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  • Best memory allocation strategy for iOS ?

    - by Mr.Gando
    Hey guys, I'm debating myself about memory allocation on iOS. I write most of my code in C++ and I really like using ObjectPools, FreeLists, etc. In order to pre-allocate a lot of the stuff that I'll be constantly "alloc/dealloc" during the course of my game, ( like particles, game entities, etc ). Still on iOS, it's not like we are developing for a console like PSP, where I can know for fact that I'll get a fixed amount of memory. iOS , will issue "memory warnings" when the system needs memory. Does anyone have some suggestions about this ? Is it too serious since the new iPod touch/iPhone 4 are carrying more RAM ? or it's still a big concern ? Thanks!

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  • How to concentrate on one project at a time. Divide and Conquer doesn't work for me [closed]

    - by refhat
    Possible Duplicate: Tips for staying focused and motivated on a project I have serious issues on concentrating on one project at a time. I cant even follow the Divide and Conquer Approach. Once I start a project, I try to get the things done as neatly as possible but very soon I end up messing so many components of it. I try to do divide and conquer, but my approach doesn't work smoothly, and then I then wonder here and there in other projects. Sometimes I try spending so many hours for some trivial issues, which in-fact are not even issues. How do I avoid this jargon and be a smooth developer and have a nice workflow around my projects. I tend to loose my concentration on the current project and wonder in another project.

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  • Grub Boot Error After Ubuntu Update

    - by Anna
    I've installed Ubuntu 10.04 with dual boot to Windows XP. I put it on auto-update. It was updating grub et al and after a restart all it says is; error:no such device: <hex number> With a grub rescue prompt. I'm in panic mode right now as it's my mother's office computer and it might have some serious repercussions for her tomorrow. What should I do? Update: It appears that the partition structure has been corrupted since it only displays (hd0) on ls

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  • Why does my Ubuntu freeze in the middle of something with a blank screen?

    - by mohamed
    I am facing a serious problem as my Dell Optiplex 745 loaded with Ubuntu 12.04 32bit freezes with a blank screen no mouse cursor no keyboard activity in many occasions. Sometimes when I open firefox, or software center, I really can't tell what the main problem is, but what i am certain about is it i have to do a hard reset to reboot. I tried to use a live-cd to boot but it did the same, tried the recovery console but couldn't find a way to fix from there (I am a new user) suspected a hardware problem but windows runs flawlessly so I believe its something related to ubuntu. Specs: Intel Celeron D 3.06 GHZ 3.0 GB ram Intel built in graphics Q965 1 TB HDD Bios Phoenex 2.6.4 Please help I really love ubuntu and I don't want to go back to windows!

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  • Windows doesn't boot after Ubuntu installation

    - by Diogo Garcia
    I have had serious problems installing Ubuntu and Windows and have dual boot. Recently I installed both operating systems, Ubuntu was the last one, and after that my computer was booting directly to Windows 7. I used my Ubuntu USB live to repair the grub, and could repair. Now I initiate my pc with grub 1.99 and Ubuntu and Windows are recognized, but Windows gives an error and don't initiate, suggesting to use Windows DVD to repair the grub. I tried that but with no effects on be behavior. I have a new asus n56vm. This conflicts with gpt and mbr have been a huge pain to me. I don't know what to to, I installed Ubuntu and Windows numerous times since I bought this computer 2 weeks ago.

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  • Successful technical communities except for open-source?

    - by Joshua Fox
    Have you ever seen a successful technical community -- e.g. user group, industry organization? Am I asking about a group of software engineers who get together F2F (or maybe online) and discuss technical and industry issues with deep zeal and interest -- a place where meaningful connections are made. Here are the only examples I have ever seen: Open source Maybe the Silicon Valley Java Users' Group Homebrew Computing Club in the '70's This sort of thing does exist in academia. Of course, there are lots of conferences and attempts at user's groups. However, almost all committed, serious software engineers, when asked about this, say "I don't have the time", which means that the organizations are not worthwhile to the best in our profession. Has anyone seen any organizations with an ongoing spirit of enthusiasm from top software engineers?

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  • What Counts For A DBA: ESP

    - by Louis Davidson
    Now I don’t want to get religious here, and I’m not going to, but what I’m going to describe in this ‘What Counts for a DBA’ installment sometimes feels like magic. Often  I will spend hours thinking about the solution to a design issue or coding problem, working diligently to try to come up with a solution and then finally just give up with the feeling that I’m not even qualified to be a data entry clerk, much less a data architect.  At this point I often take a walk (or sometimes a nap), and then it hits me. I realize that I have the answer just sitting in my brain, ready to implement.  This phenomenon is not limited to walks either; it can happen almost any time after I stop my obsession about a problem. I call this phenomena ESP (or Extra-Sensory Programming.)  Another term for this could be ‘sleeping on it’, and while the idiom tends to mean to let time pass to actively think about a problem, sleeping on a problem also lets you relax and let your brain do the work. I first noticed this back in my college days when I would play video games for hours on end. We would get stuck deep in some dungeon unable to find a way out, playing for days on end until we were beaten down tired. Once we gave up and walked away, the solution would usually be there waiting for one of us before we came back to play the next day.  Sometimes it would be in the form of a dream, and sometimes it would just be that the problem was now easy to solve when we started to play again.  While it worked great for video games, it never occurred when I studied English Literature for hours on end, or even when I worked for the same sort of frustrating hours attempting to solve a homework problem in Calculus.  I believe that the difference was that I was passionate about the video game, and certainly far less so about homework where people used the word “thou” instead of “you” or x to represent a number. This phenomenon occurs somewhat more often in my current work as a professional data programmer, because I am very passionate about SQL and love those aspects of my career choice.  Every day that I get to draw a new data model to solve a customer issue, or write a complex SELECT statement to ferret out the answer to a complex data question, is a great day. I hope it is the same for any reader of this blog.  But, unfortunately, while the day on a whole is great, a heck of a lot of noise is generated in work life. There are the typical project deadlines, along with the requisite project manager sitting on your shoulders shouting slogans to try to make you to go faster: Add in office politics, and the occasional family issues that permeate the mind, and you lose the ability to think deeply about any problem, not to mention occasionally forgetting your own name.  These office realities coupled with a difficult SQL problem staring at you from your widescreen monitor will slowly suck the life force out of your body, making it seem impossible to solve the problem This is when the walk starts; or a nap. Maybe you hide from the madness under your desk like George Costanza hides from Steinbrenner on Seinfeld.  Forget about the problem. Free your mind from the insanity of the problem and your surroundings. Then let your training and education deep in your brain take over and see if it will passively do the rest for you. If you don’t end up with a solution, the worst case scenario is that you have a bit of exercise or rest, and you won’t have heard the phrase “better is the enemy of good enough” even once…which certainly will do your brain some good. Once you stop expecting whipping your brain for information, inspiration may just strike and instead of a humdrum solution you find a solution you hadn’t even considered, almost magically. So, my beloved manager, next time you have an urgent deadline and you come across me taking a nap, creep away quietly because I’m working, doing some extra-sensory programming.

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  • Wifi works but doesn't start automatically on ubuntu 11.10

    - by Nikita Kononov
    Good evening everyone, I have got an issue which I hope you will help me to solve. I was trying to update my Kernel in ubuntu from this web-site http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.2-rc4-oneiric/ And everything went smooth. But, for some reason, my wifi doesn't work in new Kernel so I decided to switch back to my old one 3.0.0-17 generic and to my surprise WIFI doesn't start automatically eventhou it was working. What I mean is that I have to click on wifi icon and put a mark Enable Wireless. This is not a really serious issue but I don't like switch on everytime at log in my WIFI because before that it was working when system started. What is the cause of this and how to fix it. Thank you very much for you help.

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  • Is eCPMs dropping by about 50% in January a usual behavior on Google AdSense?

    - by Andrew G. Johnson
    So I just got semi-serious about running some AdSense sites over the past 6 months and the eCPM's have hovered between 1.38 and 1.42 [yes it's that close] when I look at the eCPM for each month. Obviously some deviation day to day but pretty damn close to a buck forty in aggregate. So far for January I am sitting at 0.80 for an eCPM. I know it's not a huge sample size but the daily pageviews are fairly consistent [actually a bit higher] than where they were in December. I am trying to justify this by thinking that somehow a lot of ad buyers buy inventory for the year and have to get setup to do another big buy now that it's a new calendar year but that thought isn't close to comforting. Is this happening to anyone else? EDIT: I run a lot of websites and the ratios of pageviews are about the same this month to last month but just to be clear the eCPM I posted is for 20 websites in a variety of niches, it doesn't accurately depict any one domain.

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  • How do you balance documentation requirements with Agile developments

    - by Jeremy
    In our development group there is currently discussions around agile and waterfal methodology. No-one has any practical experience with agile, but we are doing some reading. The agile manifesto lists 4 values: Individuals and interactions over processes and tools Working software over comprehensive documentation Customer collaboration over contract negotiation Responding to change over following a plan We are an internal development group developing applications for the consumption of other units in our enterprise. A team of 10 developers builds and releases multiple projects simultanously, typically with 1 - maybe 2 (rarely) developer on each project. It seems to be that from a supportability perspective the organization needs to put some real value on documentation - as without it, there are serious risks with resourcing changes. With agile favouring interactions, and software deliverables over processes and documentation, how do you balance that with the requirements of supportable systems and maintaining knowledge and understanding of how those systems work? With a waterfall approach which favours documentation (requirements before design, design specs before construction) it is easy to build a process that meets some of the organizational requirements - how do we do this with an agile approach?

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  • How to make Windows boot first?

    - by Rani.Shemer
    I want to know how to make Windows the default boot OS in Ubuntu 11.10, how to make Windows boot first on GRUB2, specifically for Windows 7, which is my current version. I know that are some tutorials about this, but it seems that I made a mistake, so I'm asking. Luckily nothing serious happened. I didn't lose my data. The difference between my question and the tutorials is that the tutorials are from older version. Sorry for any disturbs and redundancy of the question. I'll love it better for a GUI app that making easy the boot. P.S: I forgot to say the version of my OS's I am running Windows 7 Home Premium X64 bit Ubuntu 11.10 X64 bit I hope this will make understand better because I now saw it a tutorial that for 64 bit versions Startup-Manager doesn't work.

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  • What should I learn to create web-services like ones listed? [closed]

    - by Gerald Blizz
    I am very inspired by websites like imgur, dropbox, screencloud, maybe w3schools...you get my point. Fresh web-services with some new idea, not big portals but something simple yet useful and used by many people, something simple and new. What aspects of my developer career should I focus to be able to build such things on my own if I have enough ideas? (Sure if it ends up being popular I can get more developers to help me and so on, but at first I can do it alone, right?) I am currently a PHP web-developer, I know HTML+CSS+JS+AJAX+JQuery. But even like that there still is web-design, there are a lot of paths: websites for enterprise, startups, webservices, entertainment websites and serious bank/document flow systems, frameworks used for big systems, different approaches for little ones, etcetcetc. Which path should I take to be able to start my own projects like the ones that I listed on top which inspire me?

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  • What's the future of online gamedev. FLASH or UNITY?

    - by Cpucpu
    Currently, i develop for flash, not much ago i discovered unity, not yet played with it, but i have seen so far was cool. Here are my thoughts: Flash is more casual, start with cost less, in time and money. In unity you'd likely have to go more bussines-serious (real money). There are proven bussines models in flash, like adver-gaming, ads, micro-transactions. Have not seen much movement in this in Unity, too soon maybe. Flash is too heavy. By its nature(making games) Unity is way faster. Flash is 2d, doing something 3d with it turns weird and slow. Unity is natively 3d, not optimized for 2d though, it is likely feasible as well. I am overlooking the plug-in widespread, that gap will get closed over the time.

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  • Best way to store a large amount of game objects and update the ones onscreen

    - by user3002473
    Good afternoon guys! I'm a young beginner game developer working on my first large scale game project and I've run into a situation where I'm not quite sure what the best solution may be (if there is a lone solution). The question may be vague (if anyone can think of a better title after having read the question, please edit it) or broad but I'm not quite sure what to do and I thought it would help just to discuss the problem with people more educated in the field. Before we get started, here are some of the questions I've looked at for help in the past: Best way to keep track of game objects Elegant way to simulate large amounts of entities within a game world What is the most efficient container to store dynamic game objects in? I've also read articles about different data structures commonly used in games to store game objects such as this one about slot maps, but none of them are really what I'm looking for. Also, if it helps at all I'm using Python 3 to design the game. It has to be Python 3, if I could I would use C++ or Unityscript or something else, but I'm restricted to having to use Python 3. My game will be a form of side scroller shooter game. In said game the player will traverse large rooms with large amounts of enemies and other game objects to update (think some of the larger areas in Cave Story or Iji). The player obviously can't see the entire room all at once, so there is a viewport that follows the player around and renders only a selection of the room and the game objects that it contains. This is not a foreign concept. The part that's getting me confused has to do with how certain game objects are updated. Some of them are to be updated constantly, regardless of whether or not they can be seen. Other objects however are only to be updated when they are onscreen (for example, an enemy would only be updated to react to the player when it is onscreen or when it is in a certain range of the screen). Another problem is that game objects have to be easily referable by other game objects; something that happens in the player's update() method may affect another object in the world. Collision detection in games is always a serious problem. I need a way of containing the game objects such that it minimizes the number of cases when testing for collisions against one another. The final problem is that of creating and destroying game objects. I think this problem is pretty self explanatory. To store the game objects then I've considered a number of different methods. The original method I had was to simply store all the objects in a hash table by an id. This method was simple, and decently fast as it allows all the objects to be looked up in O(1) complexity, and also allows them to be deleted fairly easily. Hash collisions would not be a major problem; I wasn't originally planning on using computer generated ids to store the game objects I was going to rely on them all using ids given to them by the game designer (such names would be strings like 'Player' or 'EnemyWeapon4'), and even if I did use computer generated ids, if I used a decent hashing algorithm then the chances of collisions would be around 1 in 4 billion. The problem with using a hash table however is that it is inefficient in checking to see what objects are in range of the viewport. Considering the fact that certain game objects move (as well as the viewport itself), the only solution I could think of in order to only update objects that are in the viewport would be to iterate through every object in the hash table and check if it is in the viewport or not, updating only the ones that are in the valid area. This would be incredibly slow in scenarios where the amount of game objects exceeds 500, or even 200. The second solution was to store everything in a 2-d list. The world is partitioned up into cells (a tilemap essentially), where each cell or tile is the same size and is square. Each cell would contain a list of the game objects that are currently occupying it (each game object would be inserted into a cell depending on the center of the object's collision mask). A 2-d list would allow me to take the top-left and bottom-right corners of the viewport and easily grab a rectangular area of the grid containing only the cells containing entities that are in valid range to be updated. This method also solves the problem of collision detection; when I take an entity I can find the cell that it is currently in, then check only against entities in it's cell and the 8 cells around it. One problem with this system however is that it prohibits easy lookup of game objects. One solution I had would be to simultaneously keep a hash table that would contain all the positions of the objects in the 2-d list indexed by the id of said object. The major problem with a 2-d list is that it would need to be rebuilt every single game frame (along with the hash table of object positions), which may be a serious detriment to game speed. Both systems have ups and downs and seem to solve some of each other's problems, however using them both together doesn't seem like the best solution either. If anyone has any thoughts, ideas, suggestions, comments, opinions or solutions on new data structures or better implementations of the existing data structures I have in mind, please post, any and all criticism and help is welcome. Thanks in advance! EDIT: Please don't close the question because it has a bad title, I'm just bad with names!

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  • Starting web development with ASP.Net [closed]

    - by nayef harb
    Possible Duplicate: Fastest way to get up to speed on webapp development with ASP.NET? If you develop with ASP.NET, which other technologies do you use? How much do i need to learn in order to get an entry level asp.net job? training plan for asp.net and c# Trying to learn ASP.NET What should every programmer know about web development? I learned web development in ASP.Net couple of month ago in college, nothing serious just couple of general lessons. But now I am confused where to start, should I start with HTML and JavaScript before ASP.Net?

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  • Java EE @ No Fluff Just Stuff Tour

    - by reza_rahman
    If you work in the US and still don't know what the No Fluff Just Stuff (NFJS) Tour is, you are doing yourself a very serious disfavor. NFJS is basically a set program of world class speakers and topics offered at major US cities year round. I am proud to share with you that I recently joined the legendary NFJS troupe. My hope is that this will help solve the lingering problem of effectively spreading the Java EE message here in the US. I had my tour debut on April 4-5 with the NFJS New York Software Symposium. I did four of my most favorite talks and it was not that bad for a start - I have more in the coming months in Columbus Ohio, Denver Colorado and Austin Texas. More details on the tour posted on my personal blog. Hope to see you on the tour soon?

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  • Windows dont boot after Ubuntu installation

    - by Diogo Garcia
    I have had serious problems installing ubuntu and Windows and have dual boot. Recently i installed booth operating systems, ubuntu was the lastima one, and after that my computador was booting directly to Windows 7. I used my ubuntu USB live to repair the grub, and o could repair. Now i initiate my pc with grub 1.99 and ubuntu and Windows are recognized, but Windows gives an error and dont initiate, sugesting to use Windows DVD to repair the grub. I tried that but with no effects on be behavior. I have a new asus n56vm. This conflits with gpt and mbr have been a huge pain to me. I dont know what to to, i installed ubuntu and Windows inumerous times since i bought this cumputer 2 weeks ago. Best regards!

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  • How is an HTML5 game sold?

    - by Bane
    (I know this site doesn't give legal advice, but what I'm dealing here with isn't anything serious at all. Also, I apologize to JP for being annoying over this.) Someone found a game I made on the Internet, and expressed interest in buying it. We agreed upon a price, and, in the meantime, I removed the game's source from the Internet, just to be sure. Now, I'm wondering what to do next. These are the terms: He gets the game's source code, and only that, without the graphics (which weren't made by me). He gets the right to develop and sell the game. I get to keep the ownership of the original game, meaning that I can use it in my portfolio when applying for jobs, for example. The game gets to stay on its original site. But I am not sure how can I legally realize this. Which license can I use?

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