Many people write their own license. This is frowned upon as writing a license that does what you want involves subtle issues. Too often the wording used is either ambiguous or people create conditions that conflict with each other. Writing a license that would hold up in court is even harder. Luckily, there are a number of licenses already written that probably do what you want.
Something to always watch for: crapware installers. To make ends meet, many creators of otherwise great free software, or the services that offer the programs for download, bundle in things you don't want. Worse, the installation routine obfuscates the steps, so you provide the unwanted program tacit permission to be installed. For more about how to spot and avoid this problem, see How to Clean Crapware From a New PC, and check out the Uninstaller section of this very free software collection.
If you’re in a jam, and you need leads quickly, I don’t know of a better source than social media. I got kicked off Facebook for 30 days and I’ve been closing sales from Instagram and LinkedIn like I never missed a beat. Social media is the new age way of networking for prospects. If you’re not using social media and you want more training on how to crush social media selling, sign up at www.breakfreeacademy.com/entourage
With bought leads, these lists are typically made of potential candidates that have shown interest in related products and services to what your business may offer. So there is a good chance that at least a good chunk of these leads will prove to be successful in the conversion process. With each free sales leads that you work to obtain, there is no guarantee whatsoever that the lead will produce the results you want, and the leads in your inbox will likely be more scarce than the packed list you can purchase.
The best thing about some of these companies is that you don't have to "Like" them on Facebook, send messages on Twitter, or complete surveys. With the companies I've listed first, simply sign in, input your mailing information, and wait for the free sample to show up in your mail). It will take less than 15 minutes sign up and up to six weeks for samples to arrive.