right on.

If someone has spent the time and effort to code a product (for free) it's their choice whether they want to insert a copyright notice. You now have a choice, Use the product (copyright intact) or don't or as nexy stated pay for the unbranded version or ask the author if you make a small donation can you remove the copyright notice.

Personally, I would like to see 48pt sized copyright notices but thats just my preference.

Edit: I noticed this thread is in relation to this thread. If you take a look at the thread/product you complained about you'll see that the author stated "I depend on you. Also donations will help me to improve the product." So, make a small donation to him/her and he/she most likely allow the removal of the copyright.

Thanks for all your comments. For me it's also okay to have backlinks, most known example for implementing backlinks is Jelsoft itself for vbulletin's unbranded version. Do you think backlinks should be mentioned in product description?

There is really no need. It is not like they are hidden, if they are hidden people wouldn't see them. :p It is easy enough to uninstall a modification anyway.

No.