Hi there .
watch out for these very common other scams: These are all based on typical users not knowing either the law or their consumer rights plus they assume most people don't read "small print" carefully and don't realize what the "default" agreement contains.
1) FREE DOWNLOAD -- often means the DOWNLOAD is free but the PRODUCT ISN'T.
2) SNEAKERWARE (or SUCKERWARE) sites like DriverMax -- where they advertise they have a huge amount of drivers
and can find them for you with programs like DriverMax etc -- then to access the part of the site where they say the driver
exists you have to "PAY" to access that part of the site -- even more insidious since things like Drivers etc are essentially Public Domain software available from Manufactuers sites etc.
3) TRIAL or DEMO software where the features you want are invariably the "PRO" (I.e Pay Versions).
4) DECENT LOOKING TIME LIMITED FULL TRIALS where they will debit your payment card IF YOU DON'T CANCEL --if you must use these types of sites use a "Pre pay" credit / debit card that only has a small amount of money left so they can't collect if you accidentally forget to cancel -- and remember most Debt Collection agencies have EVEN LESS legal rights to your money than your late Grandma's dead cat. They can attempt to cajole, threaten etc etc -- but just tell them the proverbial "Go and make a sexual move with a Duck.
Really decent time limited full demos will not ask for a credit / debit card when you want to trial their software -- the Software itself should be good enough to make you want to purchase it without going in via back door methods.
I'm not against people making money or advertising on the Web -- but do it HONESTLY and not like the above examples even if the above methods are technically not illegal per se.