abolat: The fact that you have the physical media does not make it
legal to trade or rent (and even sometimes resell a game or software, though the area of reselling is often debated and varies from software to software; e.g. Microsoft Windows OS) your software.
jamyskis: There's plenty of unenforceable crap in user agreements that publishers put in to test their luck. That's basically what the severability clause is for - preventing the whole agreement from being brought down by invalid clauses. I know the first-sale doctrine has been pretty much whittled down to nothing in the US, but in Europe there is a clear difference drawn between digitally distributed software and packaged software.
The ban on resale has been struck down several times before in Germany.
Just because a publisher says in an EULA that the resale or lending of a game is not permitted does not mean that a court of law will uphold that.
Germany is usually the odd one out in these things, sadly. I wish it were the same everywhere, but it isn't. I love how Germany is going about its digital software and consumer rights. More should follow suit. However, the fact of the matter is that the EULA states that resale or lending of games is not permitted, just as it states that copying, reproducing and distributing copies of the software is restricted. I find it difficult to understand why any objective and fair court would allow restriction of one type mentioned on the EULA and not allow another.
Also, sure, maybe you would be able to take it to court should a software company send you a letter demanding a high sum of money for lending your game/software to your friend or whatever, but the outcome would not be clear from the start. It would be good to know though :)
abolat: By "bound to keep the licence for 7 years" he means the law requires you to keep that receipt for that period of time at the minimum. This does NOT mean that after 7 years the receipts are not valid NOR does it mean that the law requires you to discard receipts after that period of time. I am fairly confident that the mental and logical reasoning skills of the human race (at least those that buy products and software online) will mean that everyone will continue to keep the receipts for their digital purchases long after the minimum period required by law is over.
mg1979: I don't know what this law exactly says, but if a minimum is stated, this means to me that after this period of time the receipt becomes unimportant to prove you've bought the software. If you always need the receipt to prove that, why to set a minimum? I don't think laws are interested in logical reasoning skills, if they set a minimum, it means that after that you can trash the receipt with no consequences, whatever a reasonable person will do with his receipts. But again GOG's software without a receipt is the same as without. There's not even a warning in the EULA or in the site (afaik) that tells you you need to keep your receipts or the game's ownership cannot be proven.
Am I wrong?
If a minimum is stated, that is how long you are required by law to hold the receipt. After that period is over, you are not required to hold that receipt (by law). That doesn't mean to say that the document is worthless as proof. If it were, it would say something like "receipts should be held for 7 years after which they should be discarded as they will not be considered valid proofs of purchase". the periods are placed there based on how long the law thinks that products would need proofs of purchase (cases of warranty for example) and is a generalized figure. Under what logic did you come by the conclusion that a proof of purchase would no longer be valid after the legal MINIMUM period of keeping that proof is over? If it were a MAXIMUM, then yes, I would totally agree with you (i.e. if the law stated "proofs of purchase must be held for a maximum of 7 years" then yes it would imply and most certainly be followed by a statement saying that the said proof would no longer be valid after that period). This is a minimum not a maximum