ERROR 1: None of ECW_ENCODE_KEY and ECW_ENCODE_COMPANY were provided

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I downloaded ERDAS-ECW_JPEG_2000_SDK-5.1.1 and tried to use it with GDAL to create ECW files from georeferenced PNG files, but they are not created, it basically complains about:

ERROR 1: None of ECW_ENCODE_KEY and ECW_ENCODE_COMPANY were provided.

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I thought it was free to do so with files smaller than 500 MB (mine is 50 MB). Here the full output:

+ gdalwarp -of ECW -t_srs EPSG:4326 -srcnodata 128 -dstalpha s05w85_200_200_F1_R3_z.png s05w85_200_200_F1_R3_z.ecwCreating output file that is 14185P x 14185L.Processing input file s05w85_200_200_F1_R3_z.png.Using band 4 of source image as alpha.Copying nodata values from source s05w85_200_200_F1_R3_z.png to destination s05w85_200_200_F1_R3_z.ecw.ERROR 6: s05w85_200_200_F1_R3_z.ecw, band 1: SetNoDataValue() not supported for this dataset.ERROR 6: s05w85_200_200_F1_R3_z.ecw, band 2: SetNoDataValue() not supported for this dataset.ERROR 6: s05w85_200_200_F1_R3_z.ecw, band 3: SetNoDataValue() not supported for this dataset.0ERROR 1: None of ECW_ENCODE_KEY and ECW_ENCODE_COMPANY were provided.Both are required.ERROR 1: None of ECW_ENCODE_KEY and ECW_ENCODE_COMPANY were provided.Both are required.ERROR 1: None of ECW_ENCODE_KEY and ECW_ENCODE_COMPANY were provided.Both are required.ERROR 1: None of ECW_ENCODE_KEY and ECW_ENCODE_COMPANY were provided.Both are required..ERROR 1: s05w85_200_200_F1_R3_z.ecw, band 5: An error occured while writing a dirty blockERROR 1: s05w85_200_200_F1_R3_z.ecw, band 1: An error occured while writing a dirty blockERROR 1: s05w85_200_200_F1_R3_z.ecw, band 2: An error occured while writing a dirty blockERROR 1: s05w85_200_200_F1_R3_z.ecw, band 3: An error occured while writing a dirty blockThe only solution to get those keys is to buy that ERDAS software? again, I had the impression that it could be possible.

Any support is very welcomed,



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