Now granted most EULAs and Terms of Service documents aren't legally enforced, most software licenses explicitly prohibit decompiling or otherwise disassembling binaries.
So, yes: They have a right to stop you from "learning" from their code. If you want that right, see if they're willing to sell that right to you.
So, yes: They have a right to stop you from "learning" from their code. If you want that right, see if they're willing to sell that right to you.