MyDataTags were made by the Nuventec corporation. We created a metal microtag capable of withstanding high temperature. On this tag we laser etched a serial number identifying the owner of the tag and a website: RSDC.net
The idea of microdot technology is that they are almost invisible and thieves cannot see them. Even if a thief knows there are microdots on a valuable piece of property, the thief doesn't know how many tags to look for and remove. If he misses even a single tag the police can prove it is stolen property. So in theory a dumb thief will steal tagged property and end up in jail, while a smart thief will avoid touching any tagged property.
Unfortunately there was no market for microdot technology in the USA. Other countries such as South Africa and Australia have a fluorishing industry in plastic microdots but we found very little interest in the US. Both the product and the corporation are now defunct.
If you want to write tiny letters on a tiny tag contact me and we can look into a mutual venture.