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The HP-45 is commercial open source and available through the following on-line shops:

Shop Operating System1 Price
Android Marketplace Android €2.98

I stopped selling by Paypal. It is to much work and if overlook one e-mail one gets into to much trouble. It is not worth it.

You always purchase a license for one user and all operating systems. However with most shop you can only download the version for the indicated operating system. If you need additional OS version or the source code send me a mail with your purchasing details.