AFAIK one of the problems was that Apple disallow certain actions (like commerical usage) for software via the AppStore. You can only distribute GPL software wr

AFAIK one of the problems was that Apple disallow certain actions (like commerical usage) for software via the AppStore. You can only distribute GPL software written by someone else if you don't add any extra conditions. Apple won't distribute it via AppStore without the "no commerical usage" rules, so Apple can't carry it. DRM is fundamentally incompatible with open source licences like the GPL. You almost certainly cannot distribute other people's open source code with DRM. Other people wrote code and developed software that they'll give you the right to copy it under copyright law if you follow their rules. The AppStore does not meet those rules.