Do I need to change the pattern of a purse I make so I can legally sell it?

I am wanting to start making purses and selling them as a side business. I have a few patterns bought from stores and am going to be making my own designs also. I know that on the patterns it says that reproducing and then selling is illegal. I’ve been told if I change the pattern 10% that selling them would be legal. Does anyone know if this is true?

There has to be distinguishable changes and the labels cannot mimic the designer labels in style, color or be closely spelled so as to trick someone into thinking it’s real.

http://crochet.about.com/library/blcopyrightguide.htm?terms=copyright

Vintage Change Purse

Sarut Fic-gp01408 Chicken Coin Purse,1-Pack, Multicolored $16.00 You can never have too many chickens around and this one will carry your loose change, jewelry, lipsticks, school money or odds and ends. Great gift idea….

Greek Coffee Cup Purse $29.00 This is the paper coffee cup with a stylized Greek lettering and key motif, We are Happy to Serve You in gold and blue that New Yorkers most often get their drinks from street vendors in. It’s also widely used by homeless people asking for change, and so it follows that part of the proceeds from the sale of each purse goes to HELP USA, an organization working with the homeless since 1986. The purs…

Blue Q – Can’t Buy Me Love Coin Purse $4.98 Nice small size for those who don’t care too much for money because money can’t … you know the rest. Design by Nate Duval. 95% post consumer recycled material. 4.3″w x 3.2″h…

Time for a Change …

Sliding Doors $1.98 Nice concept, shaky execution–that about sums up the mixed blessings of British actor Peter Howitt’s intelligent but forgivably flawed debut as a writer-director. It’s got more emotional depth than most frothy romantic comedies, and its central idea–the parallel tracking of two possible destinies for a young London professional played by Gwyneth Paltrow–is full of involving possibilities. It’s …

Mondani Wallace Tote Bag $34.99 This stylish tote bag from Mondani features a spacious design that is convenient with straight, double top handles. Included with this tote bag is a zebra-designed mini purse and a change purse.

Wool Felt Tangerine Flower Change Wallet (Nepal) $7.99 Carry money, keys and change in style with a handmade felt change purse. Handmade from wool felt by artisans in Nepal, this change wallet features a lovely tangerine hue with a floral design in shades of red and orange.

Wool Felt Tangerine Daisies Change Wallet (Nepal) $8.72 Carry money, keys and change in style with a handmade felt change purse. Handmade from wool felt by artisans in Nepal, this change wallet features a beautiful color combination of tangerine and yellow.

Foam Change Purse $1.49 Includes (1) assorted Foam Change Purse.

Black Change Purse(Pack of 60) $1.99 Black change purse, with L.A. on sides.

Change Purse With Bills and Coins $24.99 H. Armstrong Roberts Change Purse With Bills and Coins – Photographic Print

Open Purse Filled With Change $24.99 H. Armstrong Roberts Open Purse Filled With Change – Photographic Print