Hi glassgirl,
A frequently asked question indeed.
As not all patterns on this site have the same copyright license, you will have to ask their respective owners about what you are allowed to do with them.
Sometimes it will say it right there on the pattern, for example: for personal use only -meaning, no, you are not supposed to use it for commercial purpose.
I know that you are allowed to sell the art made with all patterns from stainedglass.on.ca, for others, standard procedure should be to contact the artist and find out.
All patterns on this site can be used for personal uses without the need to contact the artist.
