Since the billing is performed on a quarterly base, you will usually not have to pay your fees directly after (or even before) downloading. Since we deliver therefore the data in advance "on credit", we would like to have some kind legal of contract with you.
Another legal aspect is the VAT verification required by our tax authorities.
This website allows you to search online within DECHEMA's numerical databases:
Even without registration you can search and preview the databases.
With registration you can also download the data in various formats: